I think the advantage of the textbook market is that while it's fairly low volume it's also a fairly high-dollar market. There are almost 17 million college students in the US, most of whom spend hundreds of dollars on textbooks each year; if Amazon can get each of them to spend $100 on textbooks in Kindle Editions, that would be over one and a half billion dollars a year.
The average student spends a lot more than $50 a semester on textbooks.
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